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Original question:

TPS562203: Types of failure modes

TPS562203: Failures when multiple power supply ICs are shorted inside the load

Taroimo
Intellectual 680 points
Part Number: TPS562203

Tool/software:

Dear TI team

 

I have a question related to the content of the thread below.

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1380113/tps562203-types-of-failure-modes/5283405#5283405

 

The 1.5V output of the TPS562203 mentioned in the above thread appears to be connected to the LAN communication IC.

It also appears that in addition to 1.5V, 3.3V and 1.15V are supplied to the LAN communication IC.

 

The customer is considering the possibility that the 3.3V, 1.5V and 1.15V voltage outputs are shorted inside the LAN communication IC.

If the outputs of the power supply IC are shorted inside the load, is there a possibility that the TPS562203 could be damaged?

 

Best Regards,

Taroimo

  • 0
    TI__Mastermind 30551 points

    Hi Taroimo

    Thanks for reaching out! I will check your question and get back to you during these days.

    BRs

    Lucia

  • 0 in reply to Lucia Gao
    TI__Mastermind 30551 points

    Hi Taroimo,

    Could you pls share me the system's schematic? What's the relationship between 1.5V, 3.3V and 1.15V? Same Vin power supply and each Vout connected together?

    Thanks!

    BRs

    Lucia

  • 0 in reply to Lucia Gao
    Intellectual 680 points

    Hi Lucia,

    Sorry, we do not have a schematic available at this time.

    Incidentally, the 1.5V, 3.3V, and 1.15V are all generated directly from 12V by the "TPS562203."
    (A total of three "TPS562203" are used.)

    The one that was confirmed to be faulty was the "TPS562203" that outputs "1.5V."
    (The VIN pin and GND pin appear to be short-circuited.)

    The above three Vouts are connected to a LAN communication IC.
    My customer suspects that the above three power rails are shorted on the load side, which may have caused the failure.

    Best Regards,
    Taroimo

  • +1 in reply to Taroimo
    TI__Mastermind 30551 points

    Hi Taroimo,

    Thanks for your feedback. I suspect the short of different Vout may cause the fault protection of the device but not cause the damage as you described. I would recommend you can check any potential risk I mentioned in last thread.

    Thanks!

    BRs

    Lucia